analyst.js

Lightweight client library for making requests to Analyst Server

Analyst(L, options, [options.baseUrl], [options.apiUrl], [options.tileUrl], [options.connectivityType], [options.timeLimit], [options.showPoints], [options.showIso], [options.requestOptions], [options.tileLayerOptions])

Create an instance of Analyst.js for use with single point requests.

Parameters

parameter	type	description
L	Leaflet	Pass in an instance of Leaflet so that it doesn't need to be packaged as a dependency.
options	Object	Options object.
[options.baseUrl]	String	optional: The base url, will set the tile and api urls if they are left unset
[options.apiUrl]	String	optional:
[options.tileUrl]	String	optional:
[options.connectivityType]	String	optional:
[options.timeLimit]	Number	optional: Defaults to 3600
[options.showPoints]	Boolean	optional: Defaults to false
[options.showIso]	Boolean	optional: Defaults to true
[options.requestOptions]	Object	optional: Pass in default request options to be used.
[options.tileLayerOptions]	Object	optional: Pass in default tileLayerOptions to use.

Example

const analyst = new Analyst(window.L, {
  apiUrl: 'http://localhost:3000/api',
  tileUrl: 'http://localhost:4000/tile',
  baseUrl: 'http://localhost:3000'
})

updateSinglePointLayer(key, [comparisonKey])

Update/create the single point layer for this Analyst.js instance.

Parameters

parameter	type	description
key	String	Key for accessing the single point layer tiles.
[comparisonKey]	String	optional: Key for the layer to compare against.

Example

analyst.updateSinglePointLayer(key).redraw()

Returns TileLayer, A Leaflet tile layer that pulls in the generated single point tiles.

shapefiles

Get all of the available shapefiles.

Example

analyst.shapefiles().then(function (shapefiles) {
  console.log(shapefiles)
})

Returns Promise, Resolves with a JSON list of shapefiles.

singlePointRequest(point, graphId, [shapefileId], [options])

Run a single point request and generate a tile layer.

Parameters

parameter	type	description
point	LatLng
graphId	String	Graph ID to use for this request.
[shapefileId]	String	optional: Shapefile ID to be used with this request, can be omitted for a vector request.
[options]	Object	optional: Options object.

Example

analyst
  .singlePointRequest(marker.getLatLng())
  .then(function (data) {
    analyst.updateSinglePointLayer(data.key)
  })

Returns Promise, Resolves with an object containing the results data.

singlePointComparison(point, options, comparisonOptions)

Compare two scenarios.

Parameters

parameter	type	description
point	LatLng
options	Object
comparisonOptions	Object

Example

analyst
  .singlePointComparison(marker.getLatLng(), { graphId: 'graph1' }, { graphId: 'graph2' })
  .then(([res, cres]) => {
    analyst.updateSinglePointLayer(res.key, cres.key)
  })

Returns Promise, Resolves with an array containing [results, comparisonResults]

setClientCredentials(clientCredentials)

Set the client credentials for this analyst.js instance

Parameters

parameter	type	description
clientCredentials	String

obtainClientCredentials(key, secret, refresh)

Get client credentials for this instance, optionally keeping them up-to-date automatically. Note that using this function on the client side requires your API key and secret to be sent to the client, which is non-ideal; a better pattern would be to keep the API key/secret on the server and only retrieve client credentials there, and then deliver only the client credentials to the client. Client credentials have a limited time to live, so they are less sensitive than API keys.

Parameters

parameter	type	description
key	String	Your API key
secret	String	Your API secret
refresh	boolean	if true (default), automatically update client credentials when they are about to expire.

Returns h, client credentials. They will also be set as the client credentials for this analyst instance.

Installation

Requires nodejs.

$ npm install analyst.js

Tests

$ npm test